[scheduler] Move predicate & priority registration to separate file

- Maintain list of default predicates and priorities in defaults.go
  and move the registration to separate files

Signed-off-by: Bhavin Gandhi <bhavin7392@gmail.com>

pkg/scheduler/algorithm/priorities/BUILD

@@ -18,6 +18,7 @@ go_library(
         "node_affinity.go",
         "node_label.go",
         "node_prefer_avoid_pods.go",
+        "priorities.go",
         "reduce.go",
         "requested_to_capacity_ratio.go",
         "resource_allocation.go",

pkg/scheduler/algorithm/priorities/priorities.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package priorities
+
+const (
+	// EqualPriority defines the name of prioritizer function that gives an equal weight of one to all nodes.
+	EqualPriority = "EqualPriority"
+	// MostRequestedPriority defines the name of prioritizer function that gives used nodes higher priority.
+	MostRequestedPriority = "MostRequestedPriority"
+	// RequestedToCapacityRatioPriority defines the name of RequestedToCapacityRatioPriority.
+	RequestedToCapacityRatioPriority = "RequestedToCapacityRatioPriority"
+	// SelectorSpreadPriority defines the name of prioritizer function that spreads pods by minimizing
+	// the number of pods (belonging to the same service or replication controller) on the same node.
+	SelectorSpreadPriority = "SelectorSpreadPriority"
+	// ServiceSpreadingPriority is largely replaced by "SelectorSpreadPriority".
+	ServiceSpreadingPriority = "ServiceSpreadingPriority"
+	// InterPodAffinityPriority defines the name of prioritizer function that decides which pods should or
+	// should not be placed in the same topological domain as some other pods.
+	InterPodAffinityPriority = "InterPodAffinityPriority"
+	// LeastRequestedPriority defines the name of prioritizer function that prioritize nodes by least
+	// requested utilization.
+	LeastRequestedPriority = "LeastRequestedPriority"
+	// BalancedResourceAllocation defines the name of prioritizer function that prioritizes nodes
+	// to help achieve balanced resource usage.
+	BalancedResourceAllocation = "BalancedResourceAllocation"
+	// NodePreferAvoidPodsPriority defines the name of prioritizer function that priorities nodes according to
+	// the node annotation "scheduler.alpha.kubernetes.io/preferAvoidPods".
+	NodePreferAvoidPodsPriority = "NodePreferAvoidPodsPriority"
+	// NodeAffinityPriority defines the name of prioritizer function that prioritizes nodes which have labels
+	// matching NodeAffinity.
+	NodeAffinityPriority = "NodeAffinityPriority"
+	// TaintTolerationPriority defines the name of prioritizer function that prioritizes nodes that marked
+	// with taint which pod can tolerate.
+	TaintTolerationPriority = "TaintTolerationPriority"
+	// ImageLocalityPriority defines the name of prioritizer function that prioritizes nodes that have images
+	// requested by the pod present.
+	ImageLocalityPriority = "ImageLocalityPriority"
+	// ResourceLimitsPriority defines the nodes of prioritizer function ResourceLimitsPriority.
+	ResourceLimitsPriority = "ResourceLimitsPriority"
+)